WO1989011348A1 - Hot rolling equipment for strip coils - Google Patents
Hot rolling equipment for strip coils Download PDFInfo
- Publication number
- WO1989011348A1 WO1989011348A1 PCT/JP1988/000489 JP8800489W WO8911348A1 WO 1989011348 A1 WO1989011348 A1 WO 1989011348A1 JP 8800489 W JP8800489 W JP 8800489W WO 8911348 A1 WO8911348 A1 WO 8911348A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rolling
- roll
- heating
- strip
- rolling mill
- Prior art date
Links
- 238000005098 hot rolling Methods 0.000 title description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 90
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 239000004519 grease Substances 0.000 claims description 6
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 230000005070 ripening Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 241000287463 Phalacrocorax Species 0.000 description 1
- 241000287462 Phalacrocorax carbo Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007668 thin rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
Definitions
- the present invention relates to a hot-rolling equipment suitable for a thin-plate coil, particularly a difficult-to-work thin plate.
- Technology In recent years, there has been a strong demand for miniaturization and high efficiency of electromagnetic and electronic components from the viewpoint of resource saving and energy saving, and silicon steel sheets with excellent soft magnetic properties and i. It has been.
- the soft magnetic properties of the silicon steel sheet improved with the addition of Si, showing the highest permeability especially around 6.5 wt.%, And the high intrinsic electric resistance. It is known that the loss is also small. Seed of the steel sheet of this is, S i content force;. 4 O wt or more on and Do that and workability sharply deterioration, produced on an industrial scale by i high silicon steel sheet rolling method in the conventional for this Although it was considered impossible to do this, recent research has shown that hot strip rolling is possible.
- the present invention has been made in view of such a conventional problem, and therefore does not cause cracks or the like in hard-to-work thin sheets such as high silicon steel sheets, and can efficiently elongate the sheets.
- the present invention releases the strip between the tension reels and keeps the strip at a predetermined temperature at all times during the rolling.
- the rolling equipment is designed to prevent cracks and breaks due to bending and processing, and its configuration is J9 below.
- the rolling equipment includes a rolling mill, the tension reels provided at the entrance and the exit of the rolling mill, and each of the tension reels and the Wang No. And a deflector roll provided therebetween.
- the above-mentioned tension roll is placed in a heat-retaining furnace having a heating means, and these rolls are heated by a rolling roll of a rolling mill and the above-mentioned deflector roll.
- strip heating is provided at the entrance and exit of the rolling mill.
- Equipment is provided.
- the strip is rolled between the tension reels by a rolling mill.
- Reverse rolling is performed, and in the case of a high silicon steel sheet, the hot rolling is usually about 2 leaks thick.
- the coil is rolled into a thin plate of about 0.5 mm thickness.
- the rolling roll of the rolling mill is preheated to about 200 ° C (surface temperature) by the heating means, and the deflector roll is also constantly heated to about 200 ° C (the surface temperature) by the heating means. Surface temperature).
- the strip coil is heated and maintained at a temperature of about 300 to 600 ° C in the heat retention furnace, and is unwound from one of the tension reels.
- the strip generated from the heat-retaining furnace power is rolled by rolling rolls via a deflector roll.
- the deflector roll Since the deflector roll is heated, the temperature of the strip passing through the deflector roll is suppressed, and the bending of the deflector roll is prevented. It is.
- the strip that has passed through the deflector horn is heated by a heating device at the entrance of the rolling mill to secure the strip temperature during rolling, and is then injected into the rolling mill. . Since this rolling roll is preheated, stripping of the strip also minimizes heat removal in the rolling roll.
- the strip coming out of the rolling roll is heated by a heating device provided at the outlet side of the strip.] 5
- the heated strip is heated to a higher temperature and passes through the heated deflector roll. Then, it is surrounded by the other tension reel in the heat retention furnace. Even in this heat retention furnace, strip co Isole is 200 to 600. Heated and held to about C. Then, the rolling is repeated], and the strip is rolled into a thin plate.
- the strip is always maintained at a predetermined temperature or higher (for example, 200 ° C or higher) during the reverse rolling, and the tension reel portion and the deflector Cracking due to bending and processing at the tail section and rolling section Rolling is performed while appropriately preventing breakage.
- a predetermined temperature or higher for example, 200 ° C or higher
- FIG. 1 is an explanatory view showing an embodiment of the present invention.
- Figure 2 shows the air cooling temperature drop according to the strip thickness.
- Fig. 3 shows the decrease in the temperature of the strip due to roll contact during rolling. This is shown in relation to the post-rolling temperature.
- BEST MODE FOR CARRYING OUT THE INVENTION hereinafter, embodiments of the present invention will be described with reference to the drawings.
- FIG. 1 shows an embodiment of the present invention.
- the rolling equipment includes a rolling mill (1) and tension reels (2a) (2a) ( 2 ) provided on the entrance and exit sides thereof.
- each tape down-motion differential Selector Selector b Lumpur (3) and Ru Tei includes an upper Symbol respective Te emissions provided et the between Li Lumpur and rolling mill tion Li Lumpur (2 a ) (2b) is placed in a heat retention furnace (4a) C4b) having heating means.
- Each heat retention furnace (4) is configured as a gas furnace having a heating burner (5), and any appropriate heating means can be used. Wear .
- a heating device (6) (6b) for heating the strip to be passed is provided.
- a heating furnace equipped with a furnace for example, a C gas furnace, an electric radiation heater, a radiant tube, and the like can be used.
- Each deflector roll (3) is provided with a heating means, and in this embodiment, each deflector roll (3) is configured such that high-temperature oil can be circulated inside. Has been.
- a heating means for example, Appropriate configurations can be adopted, such as disposing a burner that can directly heat the roll surface, or incorporating an electric heater inside the roll.
- the number of deflector rolls depends on the bending angle of the strip], and one or more deflector rolls are arranged according to the opening diameter and the arrangement state.
- the roll (7) is provided with a heating device for preheating the roll.))
- the roll (7) faces the upper and lower rolls (7).
- a heating burner (9) is provided.
- a heating means a high-temperature oil supply nozzle device is provided opposite to the backup roll (8), and the Wangen roll (via a backup roll) is provided.
- the structure 7) can be preheated.
- ⁇ ) is a thickness gauge
- tti) is a thermometer
- (12) is a lubricating grease supply device.
- ⁇ Nobe ⁇ is can use ho of the four double rolling mill good cormorant Ru of this embodiment, 6 double rolling mill, a 5-fold rolling mill .. planetary rolling mill, etc. 3 ⁇ 4 appropriate kind of also of, or Not only one stand but also a multiple stand reverse rolling mill can be used.
- strip heating devices are provided at the entrance and exit of each rolling mill. In this way, it is possible to use a multi-stand rolling mill], so that rolling can be performed efficiently.
- both heat retention furnaces C4a) and C4b) The strip coil (A) inside is usually kept at a temperature of 200 to 600 ° C, and each of the deflector rolls (3) is also heated. It is constantly heated so that its surface temperature is about 200.
- the rolling roll (7) is preheated or constantly heated so that its surface temperature becomes about 200 ° C, depending on its heating means.
- the sheet is bent and sent to the rolling mill (7).
- the deformer roll (3) is heated to about 200 ° C, the strip (S) is At least at such a temperature, it can be passed through without breaking.
- the strip (S) is immediately introduced into the caro loading device (), heated to a rolling temperature, and then rolled by a rolling mill (1).
- the rolling roll Since the rolling roll is heated or preheated, the strip (S) force can be prevented from being released here as well. ⁇ ⁇ Note that the rolling roll (7) does not always need to be constantly heated, for example, it is pre-heated first and the initial stage until the strip becomes sufficiently hot. In order to prevent the strip temperature from dropping during the operation, and then to transfer the heat from the strip.) ;it can .
- the rolled strip (S) is immediately introduced into a heating device (3 ⁇ 4) on the outlet side and heated, and then the same as described above. ° After strip passing the heated C about the surface temperature was de off Selector Selector port Lumpur (3), Honetsuro (4 b) in the even Cormorants one hand down-motion Li - Le ( 3 ⁇ 4).
- the strip (S) is rolled between the tension reels (2a) and (2b) as described above to form a thin plate having a predetermined thickness. You.
- Figure 2 is be sampled Clip plate cooling temperature drop amount depending on the thickness (Atmosphere 2 5 ° C in a sheet temperature 4 0 0 ° C or these drop) also Der was shown a!
- strips having a small thickness have a very large temperature drop, and therefore, the rolling of the strip can be performed without providing any heating means between the tension reels. If performed, the warm state cannot be maintained.
- Fig. 3 shows the temperature drop of the strip due to roll contact during rolling, as a function of the relationship between the surface temperature of the rolling roll and the post-rolling temperature of the strip. Therefore, it can be seen that by maintaining the rolling roll surface temperature at a predetermined temperature, rolling can be performed while effectively suppressing the drop in the temperature of the strip.
- the strip (S) is applied for a predetermined time (usually 1 to 1 step) in the heat-retention furnace C4a) (4b) between each of the strips. ,) I path between the recovery process and the child to be held [3 0 0-6 0 0. C [low temperature heat treatment].
- the strain introduced into the assembly during rolling is appropriately released, and the distortion is introduced by rolling and the moderate strain is released by the recovery processing.
- yo The texture of the final product has been improved to an advantageous form in terms of magnetic properties
- each rolling roll (7) is supplied with a lubricating grease supply device (12) from a heat-resistant lubricating grease (eg, a flash point force S300 °). Grease or more).
- a heat-resistant lubricating grease eg, a flash point force S300 °. Grease or more.
- the supply device when a high-temperature oil supply device is provided as a heating means for the rolling roll, the supply device usually applies a temperature of 200 ° C J3 ⁇ 4 to the backup roll (8). Hot oil is applied and the rolling roll (7) is preheated via the preheating of this backup roll.
- the reverse rolling is performed while maintaining the sheet temperature at least at 200 ° C. or more when bending or reduction is applied to the strip. This makes it possible to roll even hard-working steel-plates with Si: 4.0 wt% or more without causing cracks or breakage.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
This invention relates to rolling equipment suitably used to roll a strip coil made of fragile material such as high-silicon steel. This equipment is provided with a rolling mill, tension reels disposed at the inlet and outlet sides of the rolling mill, and deflector rolls disposed between the tension reels and rolling mill. The tension reels are provided in heat retaining furnaces having heating means. The rolling rolls and deflector rolls are provided with means for heating these rolls. Strip heating units are provided at the inlet and outlet of the rolling mill.
Description
明 細 ス ト リ ッ プ コ イ ル 用温 間圧延設備 技 術 分 Warm rolling equipment for fine strip coil
こ の発明は、 薄板 コ イ ル、 特に難加工性薄板に好適 な 温間 延設備に関する 。 技 術 近年、 省資源、 省エ ネ ルギーの観点か ら電磁電子部 品の 小型化や高効率化が強 く 要請さ れ、 軟磁気特性、 と i わけ鉄損の優れた珪素鋼板が要求さ れて いる 。 珪 素鋼板の軟磁気特性は S i の添加量 と と も に向上 し、 特 に 6. 5 wt 付近 で最高の透磁率 を示 し、 さ らに 固有 電気抵抗 も高い こ と か ら、 鉄損 も 小さ く な る こ とが知 られて い る 。 こ の種の鋼板は、 S i 含有量力; 4. O wt 以 上 と な る と加工性が急激 に劣 化 し、 こ のため従来では 圧延法に よ i 高 珪素鋼板を 工業的規模で製造する こ と は 不可能で ある と されていたが、 最近 の研究に よ 温 間での薄板圧延が可能で ある こ と が判って き た。 The present invention relates to a hot-rolling equipment suitable for a thin-plate coil, particularly a difficult-to-work thin plate. Technology In recent years, there has been a strong demand for miniaturization and high efficiency of electromagnetic and electronic components from the viewpoint of resource saving and energy saving, and silicon steel sheets with excellent soft magnetic properties and i. It has been. The soft magnetic properties of the silicon steel sheet improved with the addition of Si, showing the highest permeability especially around 6.5 wt.%, And the high intrinsic electric resistance. It is known that the loss is also small. Seed of the steel sheet of this is, S i content force;. 4 O wt or more on and Do that and workability sharply deterioration, produced on an industrial scale by i high silicon steel sheet rolling method in the conventional for this Although it was considered impossible to do this, recent research has shown that hot strip rolling is possible.
しか しな が ら 、 従来一般に用い られてい る圧延設備 では 、 コ イ ル の 曲げ変形や材料温度 を確保す る こ とが で きず、 高珪素鋼板の薄板圧延は難 しい。 こ の よ う な
ヒ か 、 例えば、 特開昭 6 1— 1 3 5 4 0 7 号では、 巻 戻 リ 一ルか ら圧延機第 1 ス タ ン ドま での間を保温囲壁 で覆 う よ う に した設備が提案されている が、 このよ う ¾設'備で も デフ レ ク タ ロ ール での 曲げに よ る割れや圧 延時の割れを十分防 ぐ こ と がで き ¾ い。 However, the rolling equipment generally used in the past cannot secure the bending deformation of the coil and the material temperature, and it is difficult to perform the thin rolling of high silicon steel sheet. like this For example, in Japanese Patent Application Laid-Open No. 61-135,407, a facility in which a space from the rewinding reel to the first stand of the rolling mill is covered with a heat insulating wall. However, even with such an installation, it is possible to sufficiently prevent cracking due to bending by the deflector roll and cracking during rolling.
本発明は こ の よ う な従来の問題に鑑み さ れた も の で高珪素鋼板の よ う 難加工性薄板を 割れ等を生 じる こ と る く 、 しか も能率的に E延する こ と ができ る温 間 The present invention has been made in view of such a conventional problem, and therefore does not cause cracks or the like in hard-to-work thin sheets such as high silicon steel sheets, and can efficiently elongate the sheets. Warmth
E延設備 を提供せんと する もの であ る。 発 明 の 開 示 このため本発明 は、 テ ン シ ョ ン リ ー ル間 でス ト リ ッ プを リ ー ス 圧延 し、 この圧延中 ス ト リ ッ プを常時所 定の温度に保持 し、 曲 げや加工に よ る割れ、 破断 を防 止 し得る よ う な圧延設備 と した もの で、 その構成は次 の通 J9 であ る。 す わち、 圧延設備は、 圧延機 と 、 こ の圧延機入側及び 出側に設け られる テ ン シ ョ ン リ ー ル と、 こ れら各テ ン シ ヨ ン リ 一ル と 王延機間に設けら れ る デフ レ ク タ ロ ール と を備えている 。 前記テ ン シ ョ ン リ ー ルは、 加熱手段を 有する保熱炉内に配置され、 ま た王延機の 圧延 口 一ル及び前記デフ レ ク タ ロ ー ル には これら ロ ール を加熱すべき加熱手段が付設されてい る さ らに圧延機の入口 及び 出 口 には、 ス ト リ ッ プの加熱
装置が設け られて い る。 It does not provide E-rolling equipment. DISCLOSURE OF THE INVENTION For this purpose, the present invention releases the strip between the tension reels and keeps the strip at a predetermined temperature at all times during the rolling. The rolling equipment is designed to prevent cracks and breaks due to bending and processing, and its configuration is J9 below. In other words, the rolling equipment includes a rolling mill, the tension reels provided at the entrance and the exit of the rolling mill, and each of the tension reels and the Wang No. And a deflector roll provided therebetween. The above-mentioned tension roll is placed in a heat-retaining furnace having a heating means, and these rolls are heated by a rolling roll of a rolling mill and the above-mentioned deflector roll. In addition to the heating means to be provided, strip heating is provided at the entrance and exit of the rolling mill. Equipment is provided.
こ の よ う ¾圧延設備では、 ス ト リ ッ プは テ ン シ ョ ン リ ー ル間 で圧延機に よ ] リ バー ス 圧延 され、 高珪素鋼 板の場合通常約 2 漏厚の熱延 コ ィ ルが約 0. 5 麵 厚程度 の薄板に圧延される。 圧延機の圧延 ロ ー ルは加熱手段 に よ 、 2 0 0 °C 程度 ( 表面温度 ) に予熱され、 ま たデ フ レ ク タ ロ ー ル も 加熱手段に よ 常時 2 0 0 °C程度 ( 表面温度 ) に加熱 されてい る 。 保熱炉内 でス ト リ ッ プ コ ィ ル は 3 0 0〜 6 0 0 °C程度の温度 に加熱保持されてお i 、 一方のテ ン シ ョ ン リ ー ル力ゝ ら巻戻さ れ保熱炉力 ら 出た ス ト リ ッ プは デフ レ ク タ ロ ー ル を 経由 して 圧延 ロ ール に よ 圧延さ れ る。 デフ レ ク タ ロ ー ル は加熱さ れている ため 、 これを通過する ス ト リ ッ プは 、 その温 度低下が抑え られ、 デ フ レ ク タ ロ ー ル 部での 曲げ破断 が防止さ れる。 デ フ レ ク タ ロ ーノレ を通過 した ス ト リ ッ プは、 圧延機入 口の加熱装置で圧延時の ス ト リ ッ プ温 度 を 確保する ため加熱さ れ、 圧延機に嚙 み込ま れる 。 こ の圧延 ロ ー ル は予熱さ れている ため ス ト リ ッ プは圧 延 ロ ール での抜熱 も 最少限に抑え ら れる。 圧延ロ ー ル を 出た ス ト リ ッ プはその 出 口側に設け られた加熱装'置 に よ ]5 加熱 されて温度が高め られ、 加熱さ れた デフ レ ク タ ロ ー ル を通過 して、 保熱炉 内の他方のテ ン シ ヨ ン リ ー ル に巷取 られる。 こ の保熱炉 内 で も ス ト リ ッ プ コ
イ ソレは 2 0 0〜 6 0 0。C程度に加熱保持される 。 そ して、 この よ う 圧延が繰 ]?返さ れ、 ス ト リ ッ プは薄板に圧 延される 。 In such a rolling mill, the strip is rolled between the tension reels by a rolling mill.] Reverse rolling is performed, and in the case of a high silicon steel sheet, the hot rolling is usually about 2 leaks thick. The coil is rolled into a thin plate of about 0.5 mm thickness. The rolling roll of the rolling mill is preheated to about 200 ° C (surface temperature) by the heating means, and the deflector roll is also constantly heated to about 200 ° C (the surface temperature) by the heating means. Surface temperature). The strip coil is heated and maintained at a temperature of about 300 to 600 ° C in the heat retention furnace, and is unwound from one of the tension reels. The strip generated from the heat-retaining furnace power is rolled by rolling rolls via a deflector roll. Since the deflector roll is heated, the temperature of the strip passing through the deflector roll is suppressed, and the bending of the deflector roll is prevented. It is. The strip that has passed through the deflector horn is heated by a heating device at the entrance of the rolling mill to secure the strip temperature during rolling, and is then injected into the rolling mill. . Since this rolling roll is preheated, stripping of the strip also minimizes heat removal in the rolling roll. The strip coming out of the rolling roll is heated by a heating device provided at the outlet side of the strip.] 5 The heated strip is heated to a higher temperature and passes through the heated deflector roll. Then, it is surrounded by the other tension reel in the heat retention furnace. Even in this heat retention furnace, strip co Isole is 200 to 600. Heated and held to about C. Then, the rolling is repeated], and the strip is rolled into a thin plate.
以上の よ う に、 ス ト リ ッ プは リ バース圧延中、 常時 所定の温度以上 ( 例えば 2 0 0 °C以上 ) に保持さ れ、 テ ン シ ョ ン リ ール 部、 デ フ レ ク タ 口 ール 部及び圧延部 での 曲げ、 加工に よる 割れ 破断が適切に防止されつ つ圧延が行われる。 As described above, the strip is always maintained at a predetermined temperature or higher (for example, 200 ° C or higher) during the reverse rolling, and the tension reel portion and the deflector Cracking due to bending and processing at the tail section and rolling section Rolling is performed while appropriately preventing breakage.
ま た、 高珪素鋼板の圧延の場合、 ス ト リ ップは リ バ — ス圧延の各パ ス間において保熟炉内 で保熱 される こ と に よ パ ス間 回復処理がな され、 その最大透磁率が 改善される 。 す ¾わち 圧延時に組織中に導入さ れた 歪が、 保熱炉内で保熱される こ と に よ る低温 加熱処理 に よって適度に解放され、 こ の よ う ¾ 歪導入 と 適度の 歪解放 と が繰 返さ れる こ と を通 じて最終製品 の集合 組織が変化 し、 この結果、 磁気特性が改善さ れる も の であ る 。 In the case of rolling high-silicon steel sheets, strips are heat-retained in a ripening furnace between each pass of reverse rolling, so that pass-to-pass recovery processing is performed. Its maximum permeability is improved. In other words, the strain introduced into the structure during rolling is appropriately released by the low-temperature heat treatment by keeping the heat in the heat-retaining furnace, and the strain introduction and the appropriate strain are performed. Through repeated release, the texture of the final product changes, and as a result, the magnetic properties are improved.
' 図 面 の 簡 単 な 説 明 第 1 図は本発明の一実施例 を示す説明図で あ る。 第 2 図はス ト リ ッ プ板厚に応じた空冷温度降下量を示す も ので ある 。 第 3 図は圧延中の ロ ール接触に よ る ス ト リ ツフ の温 度低下を 、 正延 ロ ール表面温 度 と ス ト リ ッ
ブの圧延後温度 と の関係で示す も の であ る 。 発明を実施するための最良の形態 以下、 本発明 の実施例 を 図面に基づいて説明す る 。 第 1 図は本発明 の一実施例 を 示す も の で 、 圧延設備 は、 圧延機(1) と 、 その入側及び 出 側に設け られ る テ ン シ ヨ ン リ ー ル (2a) (2b) と 、 各 テ ン シ ョ ン リ ー ル と 圧延 機間 に設け ら れる デフ レ ク タ ロ ー ル(3) と を 備え てい る 上 記各 テ ン シ ョ ン リ ー ル (2a) ( 2b) は、 加熱手段を 有 する保熱炉 (4a) C4b) 内 に配置されてい る 。 各保熱炉(4) は加熱バ ーナ(5) を 有する ガ ス炉 と して構成 されて いる な お、 こ の加熱手段 と して は適宜な も のを 使用す る こ と がで き る 。 FIG. 1 is an explanatory view showing an embodiment of the present invention. Figure 2 shows the air cooling temperature drop according to the strip thickness. Fig. 3 shows the decrease in the temperature of the strip due to roll contact during rolling. This is shown in relation to the post-rolling temperature. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The rolling equipment includes a rolling mill (1) and tension reels (2a) (2a) ( 2 ) provided on the entrance and exit sides thereof. and 2b), each tape down-motion differential Selector Selector b Lumpur (3) and Ru Tei includes an upper Symbol respective Te emissions provided et the between Li Lumpur and rolling mill tion Li Lumpur (2 a ) (2b) is placed in a heat retention furnace (4a) C4b) having heating means. Each heat retention furnace (4) is configured as a gas furnace having a heating burner (5), and any appropriate heating means can be used. Wear .
圧延機(1)の入 口及び 出 口 には 、 通板する ス ト リ ッ プ を 加熱する ため の加熱装置 ( ) ( 6b) が設け られてい る こ の加熱装置 と しては、 ガ ス炉 ( 例えば C ガ ス炉 ) や . 電気輻射 ヒ ー タ 、 ラ ジ ア ン ト チ ュ ー ブ等 を備え た加熱 炉 を使用す る こ と が で き る 。 At the entrance and exit of the rolling mill (1), a heating device (6) (6b) for heating the strip to be passed is provided. A heating furnace equipped with a furnace (for example, a C gas furnace), an electric radiation heater, a radiant tube, and the like can be used.
前記デ フ レ ク タ ロ ー ル (3)は圧延機の入側及び 出側 に 2 つずつ設け られて いる。 各 デフ レ ク タ ロ ー ル (3)には 加熱手段が付設 されて お 、 本実施例では、 各 デ フ レ ク タ ロ ー ル (3)は 内部 に高温 油 を 流通させ得る よ う 構成 されて いる 。 な お、 他の加熱手段 と して、 例えば 口 一
ル表面を 直接加熱する こ とができ る バーナ を近傍 配 設 し、 或いは ロ ール内部に電気ヒ ー タ を内蔵さ れる等、 適宜な構成を採用 し得 る 。 ま たデフ レ ク タ ロ ールの数 は ス ト リ ッ プの 曲げ角度に彭響する も の であ ] 、 口 一 ル径ゃ配置状態等 応 じ、 1 つ以上配置される。 Two deflector rolls (3) are provided on each of the entry side and the exit side of the rolling mill. Each deflector roll (3) is provided with a heating means, and in this embodiment, each deflector roll (3) is configured such that high-temperature oil can be circulated inside. Has been. As another heating means, for example, Appropriate configurations can be adopted, such as disposing a burner that can directly heat the roll surface, or incorporating an electric heater inside the roll. Also, the number of deflector rolls depends on the bending angle of the strip], and one or more deflector rolls are arranged according to the opening diameter and the arrangement state.
前記 延 ロ ール(7)には、 ロ ール を予熱する ための加 熱装置が付設されてお ]) 、 本実施例では上下 延 ロ ー ル(7)に対向する よ う に して加熱バ一ナ(9)が設け られて い る。 お、 この加熱手段と して高温 油の供給ノ ズル 装置をバッ ク アッ プ ロ ール(8)と 対向 して 設け、 バッ ク ア ッ プ口 ール を介 して王延 ロ ール(7)を予熱 し得る よ う ¾構造 と して も よい。 The roll (7) is provided with a heating device for preheating the roll.)) In the present embodiment, the roll (7) faces the upper and lower rolls (7). A heating burner (9) is provided. As a heating means, a high-temperature oil supply nozzle device is provided opposite to the backup roll (8), and the Wangen roll (via a backup roll) is provided. The structure 7) can be preheated.
その他 面 おい て、 αο)は厚み計、 tti)は温 ¾計、 (12) は潤壻グ リ ー ス 供給装置であ る 。 In other respects, αο) is a thickness gauge, tti) is a thermometer, and (12) is a lubricating grease supply device.
な お、 Ε延璣 )は本実施例の よ う る 4 重圧延機のほ か、 6 重圧延機、 5 重圧延機 .. 遊星圧延機等 ¾ 適宜 種類の も のを使用で き 、 ま た 1 ス タ ン ドに限 らず、 複 数ス タ ン ドの リ バース圧延機 と する こ と ができ る 。 複 数ス タ ン ドの場合には、 各圧延機の入 口及び 出 口に ス ト リ ッ プの加熱装置が設け られる 。 この よ う に複数ス タ ン ドの王延機 と する こ と に よ ]? 、 圧延 を効率的 に行 う こ と で き る。 Name your, Ε Nobe璣) is can use ho of the four double rolling mill good cormorant Ru of this embodiment, 6 double rolling mill, a 5-fold rolling mill .. planetary rolling mill, etc. ¾ appropriate kind of also of, or Not only one stand but also a multiple stand reverse rolling mill can be used. In the case of multiple stands, strip heating devices are provided at the entrance and exit of each rolling mill. In this way, it is possible to use a multi-stand rolling mill], so that rolling can be performed efficiently.
以上の よ う 圧延設備に よれば、 両保熱炉 C4a) C4b)
内 の ス ト リ ッ プ コ ィ ル (A ) は通常 2 0 0〜 6 0 0 °Cの温度 .に保熱 さ れ、 ま た各デ フ レ ク タ ロ ー ル(3) も その加熱手 段に よ その表面温度が 2 0 0で程度に る よ う 常時加 熱さ れて いる 。 ま た、 圧延ロ ー ル (7)は、 その加熱手段 に よ ] その表面温度が 2 0 0 °C程度 にる る よ う 予熱若 し く は常時加熱されて いる。 According to the rolling equipment as described above, both heat retention furnaces C4a) and C4b) The strip coil (A) inside is usually kept at a temperature of 200 to 600 ° C, and each of the deflector rolls (3) is also heated. It is constantly heated so that its surface temperature is about 200. The rolling roll (7) is preheated or constantly heated so that its surface temperature becomes about 200 ° C, depending on its heating means.
—方の テ ン シ ョ ン リ ー ル )か ら巻戻さ れた 2 0 0 〜 6 0 0 °C程度の ス ト リ ッ プ ( S ) は、 デフ レ ク タ ロ ー ル (3) で 曲げ られて圧延 口 一 ル (7)に送 ら れる が、 デ フ レ ク タ ロ ー ル (3)は 2 0 0 °C程度に加熱されている ため、 ス ト リ ッ プ (S ) は少 く と もその程度の温 ¾ に保たれて破断 する こ と な く 通板でき る 。 ス ト リ ッ プ ( S ) は 直 ちにカロ 装装置 ( ) に導入 さ れて圧延温 度ま で加熱された後、 圧延機(1 )に よ ] 9 圧延 される。 圧延 ロ ー ルは加熱ま たは 予熱さ れ てい ため こ こ で も ス ト リ ッ プ (S ) 力 らの抜 熱が防止される 。 ¾ お、 圧延ロ ー ル (7)は必ず し も 常時 加熱 してお く 必要が な く 、 例え ば最初予熱 してお て ス ト リ ッ プが十分高温 に な る ま での初期 ¾階に おけ る ス ト リ ッ プ温度低下 を 防止す る よ う に し、 その後は ス ト リ ッ プか らの 伝熱に よ ] 所定の表面温 Sに維持させ る よ う にする こ と 力;で き る 。 The strip (S) of about 200 to 600 ° C, which is rewound from the other side of the tension reel), is taken by the deflector roll (3). The sheet is bent and sent to the rolling mill (7). However, since the deformer roll (3) is heated to about 200 ° C, the strip (S) is At least at such a temperature, it can be passed through without breaking. The strip (S) is immediately introduced into the caro loading device (), heated to a rolling temperature, and then rolled by a rolling mill (1). Since the rolling roll is heated or preheated, the strip (S) force can be prevented from being released here as well.圧 延 Note that the rolling roll (7) does not always need to be constantly heated, for example, it is pre-heated first and the initial stage until the strip becomes sufficiently hot. In order to prevent the strip temperature from dropping during the operation, and then to transfer the heat from the strip.) ;it can .
圧延 さ れた ス ト リ ッ プ (S ) は 直ちに 出 口側の加熱装 置 (¾) に導入 されて加熱さ れ、 次いで上記 と同様 2 0 0
°C程度の表面温度に加熱さ れたデ フ レ ク タ 口 ール(3)を 通板 した後、 保熱炉 (4b)内の も う 一方のテ ン シ ョ ン リ - ル (¾) に巻取 られる。 ス ト リ ッ プ (S ) は テ ン シ ョ ン リ 一ル (2a) (2b) 間 で上記の よ う に して リ ノく 一 ス.圧延さ れ、 所定の厚さ の薄板 と される。 The rolled strip (S) is immediately introduced into a heating device (¾) on the outlet side and heated, and then the same as described above. ° After strip passing the heated C about the surface temperature was de off Selector Selector port Lumpur (3), Honetsuro (4 b) in the even Cormorants one hand down-motion Li - Le ( ¾). The strip (S) is rolled between the tension reels (2a) and (2b) as described above to form a thin plate having a predetermined thickness. You.
第 2 図 は ス ト リ ップ板厚に応 じた空冷温度降下量 ( 雰囲気 2 5 °C において板温 4 0 0 °Cか らの 降下量 ) を示 した も の であ !) 、 板厚が薄いス ト リ ッ プは温度降下量 が極めて大き く 、 このためテ ン シ ョ ン リ 一 ル間で何 ら 加熱手段を設ける こ と な く ス ト リ ッ プの圧延を行った 場合、 温間状態を保持 し得 い。 ま た、 第 3 図は圧延 中の ロ ール接触に よ る ス ト リ ッ プの温度低下を 、 圧延 ロ ール表面温度と ス ト リ ッ プの圧延後温度 との関係で 示 したも の で 圧延 ロ ー ル表面温度を 所定の温度に保 つ こ と に よ 、 ス ト リ ッ プの温度低下を 効果的に抑え つつ圧延を行い得る こ とが判る 。 Figure 2 is be sampled Clip plate cooling temperature drop amount depending on the thickness (Atmosphere 2 5 ° C in a sheet temperature 4 0 0 ° C or these drop) also Der was shown a! In addition, strips having a small thickness have a very large temperature drop, and therefore, the rolling of the strip can be performed without providing any heating means between the tension reels. If performed, the warm state cannot be maintained. Fig. 3 shows the temperature drop of the strip due to roll contact during rolling, as a function of the relationship between the surface temperature of the rolling roll and the post-rolling temperature of the strip. Therefore, it can be seen that by maintaining the rolling roll surface temperature at a predetermined temperature, rolling can be performed while effectively suppressing the drop in the temperature of the strip.
高珪素鋼板を以上の よ う に リ バー ス圧延する場合、 ス ト リ ッ プ 〔S) は各ぺ ス 間で保熱炉 C4a) (4b) 内 に所定 時間 ( 通常 1 〜 1 ひ 分程 , ) 保持させる こ と に よ パ ス間 回復処理 〔 3 0 0〜 6 0 0。Cの低温カ[]熱処理 ) 力;な さ れる 。 このパ ス間回復処理に よ 圧延時に組葳中に導 入さ れた歪が適度に解放され、 圧延に よ る歪導入 と 回 復処理に よ る適度の歪解放 と ¾繰 ]? 返す こ と に よ 、
最終製品の集合組織が磁気特性上有利な 形に改善さ れWhen the high silicon steel sheet is reverse-rolled as described above, the strip (S) is applied for a predetermined time (usually 1 to 1 step) in the heat-retention furnace C4a) (4b) between each of the strips. ,) I path between the recovery process and the child to be held [3 0 0-6 0 0. C [low temperature heat treatment]. By this inter-pass recovery processing, the strain introduced into the assembly during rolling is appropriately released, and the distortion is introduced by rolling and the moderate strain is released by the recovery processing. And yo, The texture of the final product has been improved to an advantageous form in terms of magnetic properties
-0 o -0 o
な お、 上記の よ う 圧延中、 各圧延ロ ー ル(7)には潤 滑 グ リ ー ス供給装置(12)か ら耐熱潤滑 グ リ ー ス ('例えば 引火点力 S 3 0 0 °C 以上のグ リ ー ス ) が供給 さ れる 。 During rolling as described above, each rolling roll (7) is supplied with a lubricating grease supply device (12) from a heat-resistant lubricating grease (eg, a flash point force S300 °). Grease or more).
ま た圧延 ロ ール の加熱手段 と して高温 油の供給装置 を 設け る場合には、 通常 こ の供給装置から バッ ク ア ツ プ ロ ー ル(8) に 2 0 0 °C J¾上の高温 油がかけ ら れ、 このバ ッ ク ア ッ プ ロ ール の予熱を介 して圧延 ロ ール(7)が予熱 され る。 In addition, when a high-temperature oil supply device is provided as a heating means for the rolling roll, the supply device usually applies a temperature of 200 ° C J¾ to the backup roll (8). Hot oil is applied and the rolling roll (7) is preheated via the preheating of this backup roll.
以上述べた本発明の装置に よれば . 少な く と も ス ト リ ッ プに 曲 げや圧下が加わる 際の板温 を 常に 2 0 0 °C以 上に保って リ バー ス 圧延 ¾ 行 う こ と がで き る ため、 例 えば S i : 4. 0 wt 以上の難加工性の鋼-板 であって も 、 割れや破断を 生 じる こ と な く 圧延す る こ と が可能 と な る o According to the above-described apparatus of the present invention, the reverse rolling is performed while maintaining the sheet temperature at least at 200 ° C. or more when bending or reduction is applied to the strip. This makes it possible to roll even hard-working steel-plates with Si: 4.0 wt% or more without causing cracks or breakage. O
ま た、 高珪素鋼板の圧延の場合 ス ト リ ッ プは リ ノ ' In the case of rolling high silicon steel sheets, the strip is Lino '
— ス E延の各パ ス 間における保熱に よ ってパ ス 間 回復 処理がる され、 これ に よ i9最終製品の磁気特性 を 改善 する こ と 力;で き る 。 - 産業 上 の 利 用 可能 性 こ の圧延設備は .. 高珪素鋼板等の難加工性薄板の圧
延に好適に利用する こ とがで き る
— The heat retention between each pass of the E-roll allows the inter-pass recovery to be performed, thereby improving the magnetic properties of the i9 final product. -Industrial applicability This rolling equipment is used for rolling of hard-to-work thin sheets such as high silicon steel sheets. Can be used in a favorable manner
Claims
(1 ) 圧延機 と、 該圧延機の入側及び 出側に設け られ る テ ン シ ョ ン リ ー ル と 、 該各テ ン シ ョ ン リ ール と 圧 延機間 に設け られる デ フ レ ク タ ロ ー ル と を .備えた 求 (1) Rolling mills, tension reels provided on the inlet and outlet sides of the rolling mill, and differentials provided between the respective tension reels and the rolling mill. Request with
王延設備であって、 前記 テ ン シ ョ ン リ ー ルは加熱 手段を有する 保熱炉 内のに配置さ れ、 圧延 ロ ー ル及 び前記デ フ レ ク タ ロ ールには, こ れ ら ロー ル を加 熱すべき 加熱手段が付設 され、 さ ら に 圧延機の入 口及び 出 口 には ス ト リ ッ プの加熱囲装置を 設けて る ス ト リ ッ プ コ イ ル用温 間圧延設備。 Wang Nobu equipment, wherein the tension roll is disposed in a heat retaining furnace having a heating means, and a rolling roll and the deflector roll are provided with a roll. A heating means for heating these rolls is provided, and a strip coil is provided at the entrance and exit of the rolling mill. Warm rolling equipment.
(2) 圧延 ロ ー ル加熱用の 加熱手段が圧延 口 ー ル を直接 加熱する 手段 であ る請求の範囲(1 )記載の設備。 (2) The equipment according to the above (1), wherein the heating means for heating the rolling roll is a means for directly heating the rolling roll.
(3) 王延 ロ ー ル加熱用の加熱手段が、 圧延機の バッ ク ア ッ プ ロ ール を介 して圧延 ロ ール を間接加熟する 手段であ る請求 の範囲(1)記載の設備。 (3) The method according to claim (1), wherein the heating means for heating the roll is a means for indirectly ripening the rolling roll via a backup roll of a rolling mill. Equipment.
(4) 加熱手段がバ ッ ク アッ プ ロ ー ル に対向 して設け ら れる 高温油の供給 ノ ズル装置で あ る 請求の範囲 ':3) 記載の設僱。 (4) The configuration according to claim '3, wherein the heating means is a high-temperature oil supply nozzle device provided to face the backup roll.
(δ) 複数 ス タ ン ド の圧延機を 有 し 各圧延機の入 口及 び 出 口 に ス ト リ ッ プの加熱装置が設け られてい る 請求の範囲(1)、 (2j . (3)ま たは(4)記載の設備 。 (δ) Claims (1), (2j. (3) wherein a plurality of stand rolling mills are provided, and a strip heating device is provided at the entrance and exit of each rolling mill. ) Or the equipment described in (4).
(6) デ フ レ ク タ ロ ー ル の加熱手段が、 ロ ール 内部 熱
媒を流通させるための構造であ る請求の範囲(1)、(6) The heating means of the deflector rolls Claims (1) having a structure for flowing the medium,
(2)、 (3)、 (4)ま たは(5)記載の設備。 Equipment described in ( 2) , (3), (4) or (5).
(7) デ フ レ ク タ ロ ール の加熱手段が、 ロ ー ルを外側か ら 加熱する加熟手段であ る請求の範囲:1)、 (2)¾ (3)、(7) Claims wherein the heating means for the deflector roll is a ripening means for heating the roll from the outside: 1), (2) ¾ (3),
(4)ま たは(5)記載の設備。 Equipment described in (4) or ( 5 ).
(8) 王延 口 一ルの近傍に、 潤滑 グ リ ー ス を供給する た めのグ リ ー ス供給装置を 有する 請求の範囲(1)、 (2) (8) Claims (1), (2) having a grease supply device for supplying lubricating grease in the vicinity of Wang Nobuguchi
(3)、 (4)、 (5) , (6)ま たは(7)記載の設備。
The equipment described in (3), (4), (5), (6) or (7).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019890700097A KR900700195A (en) | 1987-03-06 | 1988-05-23 | Warm rolling equipment for strip coil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62050293A JPS63220901A (en) | 1987-03-06 | 1987-03-06 | Warm rolling equipment for strip coil |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989011348A1 true WO1989011348A1 (en) | 1989-11-30 |
Family
ID=12854860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1988/000489 WO1989011348A1 (en) | 1987-03-06 | 1988-05-23 | Hot rolling equipment for strip coils |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0381756A4 (en) |
JP (1) | JPS63220901A (en) |
KR (1) | KR900700195A (en) |
WO (1) | WO1989011348A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW200927315A (en) | 2007-10-16 | 2009-07-01 | Ihi Metaltech Co Ltd | Method for magnesium hot rolling and magnesium hot rolling apparatus |
WO2019217279A1 (en) * | 2018-05-08 | 2019-11-14 | Materion Corporation | Methods for heating strip product |
JP2021523011A (en) * | 2018-05-08 | 2021-09-02 | マテリオン コーポレイション | How to Make Metal Matrix Composite Strip Products |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59191503A (en) * | 1983-04-15 | 1984-10-30 | Hitachi Ltd | Steckel mill |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR596449A (en) * | 1925-04-07 | 1925-10-23 | ||
BE364402A (en) * | 1929-10-10 | |||
DE702241C (en) * | 1936-02-20 | 1941-02-03 | Emil Vits | Rolling mill with direct heating of the rolling stock |
US2376240A (en) * | 1942-02-14 | 1945-05-15 | Crucible Steel Co America | Apparatus for cold rolling |
US3616669A (en) * | 1969-06-13 | 1971-11-02 | United Eng Foundry Co | Method of and apparatus for rolling flat strip |
DE2629440C3 (en) * | 1976-06-30 | 1984-04-12 | Alma-Atinskij zavod tjaželogo mašinostroenija, Alma-Ata | Internally cooled roller table roller for a sheet metal rolling mill |
AT370346B (en) * | 1981-03-25 | 1983-03-25 | Voest Alpine Ag | PLANT FOR THE HOT ROLLING OF TAPE OR TABLED ROLLED GOODS |
JPS63180311A (en) * | 1987-01-22 | 1988-07-25 | Nippon Steel Corp | Hot rolling mill |
JPS6453706A (en) * | 1987-08-24 | 1989-03-01 | Nippon Steel Corp | Device for heating and rolling |
-
1987
- 1987-03-06 JP JP62050293A patent/JPS63220901A/en active Pending
-
1988
- 1988-05-23 KR KR1019890700097A patent/KR900700195A/en not_active Application Discontinuation
- 1988-05-23 WO PCT/JP1988/000489 patent/WO1989011348A1/en not_active Application Discontinuation
- 1988-05-23 EP EP19880904624 patent/EP0381756A4/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59191503A (en) * | 1983-04-15 | 1984-10-30 | Hitachi Ltd | Steckel mill |
Non-Patent Citations (1)
Title |
---|
See also references of EP0381756A4 * |
Also Published As
Publication number | Publication date |
---|---|
KR900700195A (en) | 1990-08-11 |
EP0381756A4 (en) | 1991-09-11 |
JPS63220901A (en) | 1988-09-14 |
EP0381756A1 (en) | 1990-08-16 |
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